PIC16F877AT-I/ML - 20MHz 8-Bit MCU 14KB Flash | Microchip
MPN: PIC16F877AT-I/ML ✓ Hoạt độngPIC16F877AT-I/ML Tóm tắt
An 8-bit microcontroller is a programmable semiconductor containing a processor core, nonvolatile program memory, data memory, and peripherals on one integrated circuit. Within the product hierarchy, the PIC16F877A belongs to the PIC16 family of 8-bit RISC microcontrollers, which are designed for embedded control tasks involving digital inputs, outputs, timers, communications, and analog signal conditioning. The -AT variant combines the enhanced-flash PIC16F877A architecture with an industrial-temperature ordering option.
The verified device data identifies a 20 MHz operating speed, 14 KB (8K × 14) flash memory, 368 bytes of RAM, and 33 I/O pins. These resources make the MCU suitable for products that need substantial control logic, persistent firmware, and multiple peripheral connections without relying on a higher-cost system-on-chip design. The 44-QFN package also supports compact, surface-mount PCB assemblies, although its exposed thermal and layout requirements must be followed exactly.
The PIC16F877A device family supports established embedded-control workflows such as timer-based sequencing, digital I/O control, serial communications, and analog measurement using its integrated peripherals. Its 8-bit architecture simplifies instruction handling and is well established in industrial control, instrumentation, appliance control, and legacy peripheral equipment. Firmware portability should still be evaluated rather than assumed because software architecture, interrupt behavior, and peripheral details can vary between related PIC16 families.
Typical uses include compact industrial controllers, sensor-conditioning equipment, power and motor-control subsystems, communications modules, and embedded products that retain an installed PIC16F877A software base. The 33 I/O pins provide useful interface capacity for buttons, indicators, relays, sensors, displays, and external converters. Designers should budget several I/O pins for programming, reset, and supervisory functions before finalizing an application layout.
A primary design consideration is package verification. The target uses a 44-QFN footprint with an 8 mm × 8 mm body, so PCB land patterns, exposed-pad connection, paste volume, solder profile, and assembly clearance must match the manufacturer drawing. Software tools, oscillator settings, peripheral configuration, and application-specific timing should also be checked against the manufacturer documentation before production release.
This product page consolidates verified distributor specifications, lifecycle information, same-footprint replacement candidates, package considerations, and application guidance. It also distinguishes documented compatibility evidence from parameters that still require confirmation, helping engineers make sourcing and design decisions without treating related part numbers as automatic drop-in replacements.
Bộ thay thế dễ dàng lắp đặt cho PIC16F877AT-I/ML — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với PIC16F877AT-I/ML (cùng hình factor và footprint) — khác nhau ở Package, ADC, Operating Temperature, I/O Pins, Program Memory (Flash).
PIC16F877A-I/ML
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →PIC16F887-I/ML
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →PIC16F1789-I/ML
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →PIC16F1827-I/ML
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →PIC16F1823-I/ML
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →PIC16F877AT-I/ML Tỷ lệ tối đa & tính chất điện
| Microcontroller Type | 8-bit PIC16 microcontroller |
| Maximum CPU Frequency | 20 MHz |
| Program Memory Type | Flash |
| Flash Memory Size | 14 KB (8K × 14 words) |
| RAM Size | 368 bytes |
| I/O Pin Count | 33 pins |
| Hộp | 44-QFN (8 mm × 8 mm) |
| Architecture | PIC16 8-bit architecture |
| Trạng thái vòng đời | Active |
| Temperature Grade | Industrial grade (-I) |
| Kiểu lắp đặt | Surface mount |
| Program Memory Words | 8K × 14 words |
Hướng dẫn cấu hình chân PIC16F877AT-I/ML 44-qfn (8 mm × 8 mm)
Cấu hình chân cho PIC16F877AT-I/ML (44-qfn (8 mm × 8 mm) gói). IC số này bao gồm chân GPIO, giao diện truyền thông (UART, SPI, I2C) và chân nguồn. Tham khảo tài liệu thông số kỹ thuật của nhà sản xuất để biết các chức năng chân thay thế và tùy chọn cấu hình. Cực kỳ quan trọng cho thiết kế hệ thống tích hợp và lập trình PCB.
Không có dữ liệu chân cụ thể sẵn có cho PIC16F877AT-I/ML.
Tham khảo: tài liệu kỹ thuật cho cấu hình chân đầy đủ.
Ứng dụng tiêu biểu
PIC16F877AT-I/ML phù hợp cho 6 Áp dụngs: Industrial Control Panels, Sensor Conditioning Equipment, Appliance and Equipment Controllers, Communications Interface Modules, Power and Motor Control Subsystems, Data Acquisition and Logging Devices.
Industrial Control Panels
The PIC16F877AT-I/ML fits compact industrial control panels because it combines a 20 MHz CPU, 14 KB of flash, 368 bytes of RAM, and 33 I/O pins. Those resources can support switch inputs, status LEDs, relay or solenoid drivers, and production counters without an external memory device. The -I ordering suffix identifies an industrial-temperature option, although the exact limits remain [DATA_NEEDED: operating temperature range]. Designers should verify every output driver, isolation boundary, and fault-state response. Firmware must also include input debouncing and safe output defaults rather than relying solely on the MCU. Because the verified 44-QFN package is only 8 mm × 8 mm, the board must follow the manufacturer’s exposed-pad and land-pattern requirements closely to maintain solderability and heat transfer.
Được đề xuất
Sensor Conditioning Equipment
The PIC16F877AT-I/ML is suitable for sensor-conditioning products that must sample external transducers and apply control logic on one board. Its 20 MHz processing rate supports timed acquisition, filtering, calibration, threshold evaluation, and data formatting, while 14 KB of flash preserves firmware between power cycles. The 33 I/O pins can accommodate sensor interfaces, alarm outputs, and communication signals. For analog measurements, the complete signal chain must include suitable sensor excitation, filtering, and input conditioning; the supplied data does not specify the device’s ADC resolution or analog performance. Firmware should account for calibration, noise, and sensor-settling time. Layout should isolate analog and digital return paths and provide stable bypassing near the device, particularly when the target operates near its 20 MHz maximum frequency.
Được đề xuất
Appliance and Equipment Controllers
The PIC16F877AT-I/ML can serve as the central controller in appliances and laboratory equipment where deterministic embedded logic, persistent firmware, and moderate I/O capacity are required. A 20 MHz clock and 14 KB flash provide room for state machines, timing sequences, fault handling, and interface routines, while 368 bytes of RAM accommodates practical working buffers. The MCU can coordinate buttons, displays, heaters, motors, and status indicators, although suitable driver circuits remain necessary for loads above logic-level current. Firmware should include watchdog recovery, safe-state transitions, and brownout-aware power sequencing to improve field reliability. The compact 44-QFN package helps reduce board area, but assembly yield and thermal performance depend on using the exact exposed-pad geometry and solder profile specified by Microchip.
Được đề xuất
Communications Interface Modules
The PIC16F877AT-I/ML is appropriate for compact communications modules that require a separate host MCU for protocol handling, framing, status reporting, and configuration. Its 20 MHz performance supports interrupt-driven byte processing, while 14 KB flash stores protocol routines and 368 bytes of RAM supports transmit and receive buffers. The 33 I/O pins leave sufficient parallel and serial interface capacity for transceivers, connectors, configuration switches, and indicators. Actual protocol throughput will depend on the selected peripheral, interrupt latency, buffer strategy, and external line-driver characteristics. The MCU should not drive a communication line directly unless the electrical interface explicitly permits it. Firmware needs overrun handling, framing checks, and timeouts, while the PCB should separate transceiver return currents from sensitive controller ground paths.
Được đề xuất
Power and Motor Control Subsystems
The PIC16F877AT-I/ML can be used as the supervisory controller for a power conversion or motor-control subsystem. Its 20 MHz execution rate supports closed-loop sequencing, current and voltage sampling, fault detection, and actuator command generation, while 14 KB of flash stores control tables and diagnostic logic. The 33 I/O pins provide ample connectivity for gate drivers, control signals, and fault inputs. Power semiconductors and motor drivers require separate protection, isolation, and thermal design; the microcontroller should not directly absorb their switching energy. Firmware must define safe outputs during reset and watchdog recovery, and dead-time or interlocks should be implemented where switching hardware requires them. PCB placement should keep high-current and high-dv/dt loops compact while protecting the MCU’s supply and reference paths.
Được đề xuất
Data Acquisition and Logging Devices
The PIC16F877AT-I/ML supports compact data-acquisition and logging products where an 8-bit controller must handle sensor inputs, local status, and stored configuration. Its 20 MHz clock is suitable for deterministic sampling control and protocol formatting, while 14 KB flash provides nonvolatile firmware and 368 bytes of RAM supports temporary sample and transfer buffers. The 33 I/O pins can be allocated among digital sensors, storage-control signals, communications, and operator inputs. The supplied evidence does not establish ADC resolution, data-conversion rate, or external-memory interfaces, so those capabilities must be confirmed before assigning an analog acquisition specification. Firmware should include timestamp handling, buffer-overrun protection, and validated storage sequences. The package layout also needs adequate local bypassing and controlled clock routing to prevent acquisition noise from disturbing adjacent circuitry.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC16F877AT-I/ML — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | PIC16F877A-I/ML | PIC16F887-I/ML | PIC16F1789-I/ML | PIC16F1827-I/ML | PIC16F1823-I/ML |
|---|---|---|---|---|---|---|
| Package | 44-QFN (8x8) | 44-QFN (8x8) | 44-QFN (8x8) | 44-QFN (8x8) | 44-QFN (8x8) | 44-QFN (8x8) |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| CPU Architecture | 8-bit PIC16 | 8-bit PIC16 | 8-bit PIC16 | 8-bit PIC16 | 8-bit PIC16 | 8-bit PIC16 |
| Maximum Frequency | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
| Flash Memory | 14 KB (8K × 14 words) | 14 KB (8K × 14 words) | 14 KB | 8 KB | 8 KB | 8 KB |
| Program Memory Type | Flash | Flash | Flash | Flash | Flash | Flash |
Bảo phân biệt quan trọng
- Established PIC16F877A memory and interface profile (vsPIC16F1789-I/ML)
- Direct same-package family option with matching core speed (vsPIC16F887-I/ML)
- Closest ordering-code configuration (vsPIC16F877A-I/ML)
Ghi chú thiết kế
Use the manufacturer’s exact 44-QFN land pattern rather than generating a generic QFN footprint from body dimensions alone. The 8 mm × 8 mm package may include an exposed thermal pad that must be connected according to the package drawing, and paste volume must be controlled to avoid voiding or solder bridging between fine-pitch leads. Confirm the PCB stack-up, solder-mask expansion, courtyard, and assembly process with the selected manufacturing partner.
Place the required input and output bypass capacitors immediately beside their corresponding package pins, following the manufacturer layout and capacitor-selection guidance. Keep the high-current return path short and avoid routing return current beneath noisy or switching nodes. Because the supplied data does not specify the complete power-supply limits, input-voltage tolerances, and decoupling values, those requirements must be obtained from the manufacturer datasheet before schematic release.
Keep clock, programming, and sensitive sensor routes away from switching-power and relay-driver currents. Route the exposed-pad connection according to the manufacturer drawing and provide uninterrupted ground copper where practical. If communication transceivers or motor drivers share the board, establish return-current paths so their high-current loops do not pass beneath the MCU or its bypass network. Review crosstalk and return displacement during PCB sign-off.
Do not treat a matching 44-QFN footprint as proof of complete drop-in equivalence. A replacement may use the same package while changing interrupt vectors, timer registers, peripheral channels, configuration bits, or PWM behavior. Before substitution, compare the manufacturer pin and code compatibility chart, verify programming-device support, compile the existing firmware, test all used peripherals, and perform a timing and failure-mode review on production hardware.
Thông tin tuân thủ
The supplied verified snippets do not state RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status for this MPN. AEC-Q100 is recorded as not_applicable because no automotive qualification was identified.
